Admin - Configuration - Product Listing - Product List Sort Order Ascending - Catalog

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Menu: Admin - Configuration - Product Listing - Product List Sort Order Ascending - Catalog

/path/to/your/shop/includes/functions/functions_general.php

Line #505 : $sort_suffix = (substr($sortby, 0, 1) == $colnum ? (substr($sortby, 1, 1) == 'a' ? PRODUCT_LIST_SORT_ORDER_ASCENDING : PRODUCT_LIST_SORT_ORDER_DESCENDING) : '') . '</a>';